Earlier quoted context omitted.
Compared to the big e-commerce retailers, Costco's total number of sku's isn't even a rounding error. And most of Costco's sku's are food, clothing, housewares, bulk consumables, and such - vastly easier to test and vet than computer & internet-connected electronics.
Sounds like you're agreeing that Costco is well curated?
But that's kinda like saying that Random Pond is safer for swimming than a lava lake.
Do I just assume nothing can go wrong when I myself shop at Costco? NO.